Foam Board Insulation Attic Rafters

2 measure and cut the foam boards as.
Foam board insulation attic rafters. 100 free of cfcs vocs penta bdes urea formaldehyde. Insulating boards are just one of the many types of foam insulation. Class i e 84 fire retardant meets building code spec. Consider using spray foam insulation as well to seal smaller cracks and gaps.
R value of 7 in 1 inch 97 closed cell foam. The superattic system utilizes proprietary silverglo rigid foam insulation panels to fully seal and insulate the attic directly beneath the roof rafters and directly inside the gable ends. Better than spray foam thermal break and relatively consistent r 30. Get your kits the easy to use spray foam kit.
Use closed cell foam it green for attic rafters. Select rigid foam insulation boards that are at least 1 2 inch less in thickness than the rafter space is deep if you plan to finish the attic as living space. The best attic insulation. Here s how to use 3 layers of 2 inch polyiso foam board to meet code and keep your ne.
Often the r value of fiberglass insulation is too low and requires the rafters to be retrofitted making foam board a better choice.